Formal Labs

​Alcohol and grams of H20 used	Ti degrees C	Tf degrees C	Mi grams	Mf grams	(Molar) ENTHALPY!!! KJ/mol
N-Ayml	21	45	120.395	119.145	-707.45664
Pentanol (100 g of H20)	21	55	114.773	113.001	-707.0646766
Isopropyl alcohol (100g of H2O)	22.1	48.2	94.073	92.377	-386.60317217
Propanol (99.9 g of H2O)	19.9	56.0	107.174	104.617	-354.642875556
Isopentyl Alcohol (100g of H2O)	34.0	38.0	114.41	114.02	-378.129230769
Butanol (100.0g of H2O)	23.8	74.6	107.157	104.456	-582.707785265
Ethanol (100g of H2O)	35.0	55.8	107.361	106.287	-372.939892678

I <---Feel free to use this Logo for the Lab

I do not know if anyone else has already filled in the chart in their books but not the wiki, but if you have, check my numbers, because they seem wayyyyyyyyy off, and if they are really wrong, I would appreciate someone showing me how to do it right. thanks - Scott, P.S. I could not find the molar mass of pentatol or pentathol or whatever it is supposed to be.
The molar mass of Pentanol is 88 g/mol - Manuel
Anything relevant about the formal lab....write here!

I used the formula -(mct of H2O)(MM alcohol)/g(alcohol) = C of Alcohol and I went over most peoples data and it matched up so these molar enthalpies are definitely consistent with the data we have up there. But I can't make head or tail of what conclusion we're supposed to draw from this. Personally, I thought we were gonna see a steady increase in enthalpy as the molecule structure got longer and longer so the order would look something like this:
Ethanol
Propanol
Isopropyl Alcohol (i'm not too sure about where the Isopropyls should go considering their molar mass is the same but their structure is branched...)
Butanol
Pentanol
N-Ayml
Isopropyl Alcohol
-Manuel

Okay, me Scott and Ben were talking, and we decided that everyone should calculate their own enthalpy for their alcohols so that we dont have to calculate it 7 times.

Thx

-Peter

Heyy guys! If you need help formatting/referencing in APA, I know this website that is good. It has samples and it breaks the process down so it doesn't look as complicated to do =)
http://owl.english.purdue.edu/owl/resource/560/01/
I'm pretty sure we need to write the format mostly in APA.
-Orlean
​
Heats of Combustion
Data Table


HERE'S what i got for expected results off the internet
can everyone compare theirs and tell me if i got any mistakes?

Expected Enthalpy KJ/mol
-3329
-3329
-2006 (1)
-2021
-2264
-2676
-1367

(1) http://webbook.nist.gov/cgi/cbook.cgi?ID=C67630&Units=SI&Mask=2#Thermo-Condensed

What are we doing with the double in the alcohol?
-qing

Qing, can you reference where you got your results?
And I'm not 100% sure on what to do with the double scenario either...
-Orlean

Do we include percent error in the results or discussion??
-Simone
OH! And also, what do we put in the results vs the discussion?? I'm kinda confused.

Results: the expected enthalpies vs. the experimental enthalpies.
a graph of the molar mass vs. enthalpy, all the other raw data/analysed data that you've collected
Discussion: through calorimetry, it can be determined that the enthalpies should be this way. The enthalpies seem to increase with added molar mass. Any other comments you want to make about the data/results (and also sources of error).
That's what I'm going to include, I think (does that help a bit?)
Andy~

http://www.creative-chemistry.org.uk/gcse/documents/Module7/N-m07-24.pdf
Here's some of the enthalpies.